Except when the train is operated by Deutsche Bahn. Then you wish you were walking from Düsseldorf to Munich.

These things are very heavily optimized for the singular purpose of reading books. They can’t do much of anything else, but they do that one thing very well and very efficiently. They run a custom, lightweight Linux OS that’s very aggressive with its battery management. Coupled with an e-ink display, they sip power and can run for weeks on a single charge. That’s not something a simple android can provide.